Ductile fracture in notched bulk metallic glasses
文献类型：期刊论文
| 作者 | Pan, J.; Wang, Y. X.; Li, Y.; Li, Y (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China. |
| 刊名 | PERGAMON-ELSEVIER SCIENCE LTD
 |
| 出版日期 | 2017-09-01 |
| 卷号 | 136页码:126-133 |
| ISSN号 | 1359-6454 |
| 关键词 | Bulk Metallic Glasses Triaxial Stress State Ductile Fracture Cavitation Decohesion Stress |
| 英文摘要 | The deformation of bulk metallic glasses (BMGs) is generally driven by highly localized shear. Due to such inhomogeneous flow, failure occurs in a catastrophic brittle manner through rapid shear banding, often associated with very limited plastic strain macroscopically. Here, we demonstrate metal-like ductile fracture in Zr-based BMGs under tension, a completely opposite situation, by suppressing shear banding. In the absence of shear bands, nucleation of cavies/voids and subsequent void growth and coalescence dominate the initial plastic failure process, enabling BMGs to display the essential characteristics of ductile fracture, with deep dimples and cup-and-cone morphology. This ductile fracture only occurs in amorphous alloys, but not in the fully crystallized counterpart. Furthermore, the characteristic decohesion strength of the ductile fracture in Zr-based BMGs was found to be 1.75 GPa, one of the highest among engineering metals and alloys. These present findings reveal the previously hidden ductile behavior of BMGs, suggesting an alternative method to enhance the ductility of BMGs by removing shear banding. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; The deformation of bulk metallic glasses (BMGs) is generally driven by highly localized shear. Due to such inhomogeneous flow, failure occurs in a catastrophic brittle manner through rapid shear banding, often associated with very limited plastic strain macroscopically. Here, we demonstrate metal-like ductile fracture in Zr-based BMGs under tension, a completely opposite situation, by suppressing shear banding. In the absence of shear bands, nucleation of cavies/voids and subsequent void growth and coalescence dominate the initial plastic failure process, enabling BMGs to display the essential characteristics of ductile fracture, with deep dimples and cup-and-cone morphology. This ductile fracture only occurs in amorphous alloys, but not in the fully crystallized counterpart. Furthermore, the characteristic decohesion strength of the ductile fracture in Zr-based BMGs was found to be 1.75 GPa, one of the highest among engineering metals and alloys. These present findings reveal the previously hidden ductile behavior of BMGs, suggesting an alternative method to enhance the ductility of BMGs by removing shear banding. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| 学科主题 | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| 资助机构 | National Natural Science Foundation of China [51401220, 51471165] |
| 公开日期 | 2018-01-10 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/79130]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Li, Y (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Pan, J.,Wang, Y. X.,Li, Y.,et al. Ductile fracture in notched bulk metallic glasses[J]. PERGAMON-ELSEVIER SCIENCE LTD,2017,136:126-133. |
| APA | Pan, J.,Wang, Y. X.,Li, Y.,&Li, Y .(2017).Ductile fracture in notched bulk metallic glasses.PERGAMON-ELSEVIER SCIENCE LTD,136,126-133. |
| MLA | Pan, J.,et al."Ductile fracture in notched bulk metallic glasses".PERGAMON-ELSEVIER SCIENCE LTD 136(2017):126-133. |
入库方式： OAI收割
来源：金属研究所
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